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High Energy Physics - Phenomenology

arXiv:2212.11977 (hep-ph)
[Submitted on 22 Dec 2022 (v1), last revised 5 Apr 2025 (this version, v2)]

Title:Primordial Black Holes as a Factory of Axions: Extragalactic Photons from Axions

Authors:Yongsoo Jho, Tae-Geun Kim, Jong-Chul Park, Seong Chan Park, Yeji Park
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Abstract:Primordial black holes (PBHs) are significant sources of axions and axion-like particles (ALPs), provided their Hawking temperature exceeds the particles' masses. Given the predominant decay of axions into photons, the enhanced photon spectrum they generate can be feasibly detected using sensitive detectors. This paper introduces a novel methodology that elucidates the decay process for particles to traverse and decay over cosmological timescales. Specifically, we derive estimations for the photon spectrum and flux, assuming a monochromatic mass spectrum and isotropic distribution for PBHs. Encouragingly, forthcoming detectors like e-ASTROGAM are well positioned to capture this signal.
Comments: 13 pages, 7 figures; title changed, updated figures
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:2212.11977 [hep-ph]
  (or arXiv:2212.11977v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2212.11977

Submission history

From: Jong-Chul Park [view email]
[v1] Thu, 22 Dec 2022 18:58:35 UTC (2,882 KB)
[v2] Sat, 5 Apr 2025 11:38:03 UTC (3,013 KB)
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